Objective / Rules- Light up every square in the grid.- A number in a square indicates how many bulbs share an edge (but not diagonally) with that square.- A square is lit if it's in the same row or column as a bulb, as long as there are no Black blocks between them.- No bulb may light another bulb.

CheckingIf you click 'Check' the system will check for incorrect squares. If 'Show mistakes when checking' is checked they will be marked in red. If 'Highlight clues' is checked any clue where the correct number of bulbs surround the clue will be highlighted - this does not mean that the answer is correct.

UniquenessEach puzzle has exactly one solution, which can be found using logic alone and no guesses are ever required. If you think you've found another solution, then please double check the rules.

JavaScriptThis game requires JavaScript to be enabled, with the ability to change the default right click action.

[Unique Reference = LightUp-1011-20x20-Hard-135066]

BrainBashers™ is a trademark. This website uses cookies. By using this website you are accepting the use of cookies. For more information please view the privacy policy. By using this website you are also agreeing to the terms and conditions.